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Fair value measurements (Details) (EUR €)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Jun. 30, 2007
Assets        
Derivative financial instruments € 151,748,000 € 126,351,000    
Liabilities        
Long-term debt 759,490,000 736,368,000    
Derivative financial instruments 10,893,000 40,359,000    
Fair value measurements (Textual) [Abstract]        
Percentage of hedged senior notes 5.75%      
Senior notes due, year of maturity 2017      
Impairment charges on property, plant and equipment 3,234,000 12,272,000 8,600,000  
Impairment of goodwill and other intangible asset 0      
Principal amount 600,000,000     600,000,000
Carrying amount 710,095,000 695,618,000    
Estimated fair value of assets 100,000      
Transfers between levels 0 0    
Recurring [Member]
        
Assets        
Derivative financial instruments 151,748,000 [1] 126,351,000 [1]    
Money market funds 385,420,000 [2] 369,238,000 [2]    
Short-term investments 930,005,000 [3]    [3]    
Total 1,467,173,000 495,589,000    
Liabilities        
Long-term debt 759,490,000 [4] 736,368,000 [4]    
Derivative financial instruments 10,893,000 [1] 40,359,000 [1]    
Total 770,383,000 776,727,000    
Recurring [Member] | Level 1 [Member]
        
Assets        
Derivative financial instruments    [1]    [1]    
Money market funds 385,420,000 [2] 369,238,000 [2]    
Short-term investments 279,988,000 [3]    [3]    
Total 665,408,000 369,238,000    
Liabilities        
Long-term debt    [4]    [4]    
Derivative financial instruments    [1]    [1]    
Total          
Recurring [Member] | Level 2 [Member]
        
Assets        
Derivative financial instruments 151,748,000 [1] 126,351,000 [1]    
Money market funds    [2]    [2]    
Short-term investments 650,017,000 [3]    [3]    
Total 801,765,000 126,351,000    
Liabilities        
Long-term debt 759,490,000 [4] 736,368,000 [4]    
Derivative financial instruments 10,893,000 [1] 40,359,000 [1]    
Total 770,383,000 776,727,000    
Recurring [Member] | Level 3 [Member]
        
Assets        
Derivative financial instruments    [1]    [1]    
Money market funds    [2]    [2]    
Short-term investments    [3]    [3]    
Total          
Liabilities        
Long-term debt    [4]    [4]    
Derivative financial instruments    [1]    [1]    
Total          
[1] Derivative financial instruments consist of forward foreign exchange contracts and interest rate swaps. See Note 3.
[2] Money market funds are part of our cash and cash equivalents.
[3] Short-term investments consist of Dutch Treasury Certificates and deposits with the Dutch government.
[4] Long-term debt mainly relates to our EUR 600.0 million Eurobond (fair value as at December 31, 2012: EUR 710.1 million (2011: EUR 695.6 million) and excludes accrued interest. For further details see Note 14.